public class SomeObjectExtension {
    private final ApexPages.standardController controller;
    private final Contact obj;

    public SomeObjectExtension(ApexPages.StandardController stdController) {
        this.controller = stdController;
        this.obj = (Contact)stdController.getRecord();
    }

    public SelectOption[] getLocationOptions() {
        SelectOption[] locations = new SelectOption[]{};
        locations.add(new SelectOption('','--None--'));
        for (Account l : [select id, name, AccountNumber, Industry from Account where isdeleted = false order by name]) {
            locations.add(new SelectOption(l.id, l.name + ' (' + l.AccountNumber + ', ' + l.Industry + ')'));
        }
        return locations;
    }
}